开发软件时对提高开发人员工作效率至关重要的是( )。

A．操作系统的资源管理功能

B．先进的软件开发工具和环境

C．程序人员的数量

D．计算机的并行处理能力

Which of the following statements about the characteristics of a monopoly and those of an oligopoly is least accurate（）

A. In an oligopoly, there are often substantial economies of scale.

B. In both a monopoly and an oligopoly, there are high entry barriers into the market.

C. In an oligopoly, the decisions of each seller are independent of the policies followed by competitors.